import pygame
from pygame.locals import *
from sys import exit 

from random import *

pygame.init()
screen = pygame.display.set_mode((640, 480), 0, 32)

screen.lock()
for count in range(10):
    random_color = (randint(0,255), randint(0,255), randint(0,255))
    random_pos = (randint(0,639), randint(0,479))
    random_size = (639-randint(random_pos[0],639), 479-randint(random_pos[1],479))
    pygame.draw.rect(screen, random_color, Rect(random_pos, random_size))

screen.unlock()

pygame.display.update()

while True:
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            exit()
